From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch adds a virtio_scsi_cmd_req_pi header as recommened by
Paolo that contains do_pi_niov + di_pi_niov elements used for
signaling when protection information buffers are expected to
preceed the data buffers.
Also add new VIRTIO_SCSI_F_T10_PI feature bit to be used to signal
host support.
v4 changes:
- Use pi_bytesout + pi_bytesin instead of niovs (mst + paolo)
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Sagi Grimberg <sagig@xxxxxxxxxxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
include/linux/virtio_scsi.h | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/include/linux/virtio_scsi.h b/include/linux/virtio_scsi.h
index 4195b97..7344906 100644
--- a/include/linux/virtio_scsi.h
+++ b/include/linux/virtio_scsi.h
@@ -35,11 +35,23 @@ struct virtio_scsi_cmd_req {
u8 lun[8]; /* Logical Unit Number */
u64 tag; /* Command identifier */
u8 task_attr; /* Task attribute */
- u8 prio;
+ u8 prio; /* SAM command priority field */
u8 crn;
u8 cdb[VIRTIO_SCSI_CDB_SIZE];
} __packed;
+/* SCSI command request, followed by protection information */
+struct virtio_scsi_cmd_req_pi {
+ u8 lun[8]; /* Logical Unit Number */
+ u64 tag; /* Command identifier */
+ u8 task_attr; /* Task attribute */
+ u8 prio; /* SAM command priority field */
+ u8 crn;
+ u32 pi_bytesout; /* DataOUT PI Number of bytes */
+ u32 pi_bytesin; /* DataIN PI Number of bytes */
+ u8 cdb[VIRTIO_SCSI_CDB_SIZE];
+} __packed;
+
/* Response, followed by sense data and data-in */
struct virtio_scsi_cmd_resp {
u32 sense_len; /* Sense data length */
@@ -97,6 +109,7 @@ struct virtio_scsi_config {
#define VIRTIO_SCSI_F_INOUT 0
#define VIRTIO_SCSI_F_HOTPLUG 1
#define VIRTIO_SCSI_F_CHANGE 2
+#define VIRTIO_SCSI_F_T10_PI 3
/* Response codes */
#define VIRTIO_SCSI_S_OK 0
--
1.7.10.4
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